MPII_DMA_KVA
rfp = MPII_DMA_KVA(sc->sc_reply_freeq);
cmd = MPII_DMA_KVA(sc->sc_requests);
uintptr_t kva = (uintptr_t)MPII_DMA_KVA(sc->sc_replies);
rfp = MPII_DMA_KVA(sc->sc_reply_freeq);
sc->sc_reply_postq_kva = MPII_DMA_KVA(sc->sc_reply_postq);